package com.syt.mall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.Channel;
import com.syt.common.enume.OrderStatusEnum;
import com.syt.common.exception.NotStockException;
import com.syt.common.to.mq.OrderTo;
import com.syt.common.to.mq.StockDetailTo;
import com.syt.common.to.mq.StockLockedTo;
import com.syt.common.utils.R;
import com.syt.mall.ware.entity.WareOrderTaskDetailEntity;
import com.syt.mall.ware.entity.WareOrderTaskEntity;
import com.syt.mall.ware.feign.OrderFeignService;
import com.syt.mall.ware.feign.ProductFeignService;
import com.syt.mall.ware.service.WareOrderTaskDetailService;
import com.syt.mall.ware.service.WareOrderTaskService;
import com.syt.mall.ware.vo.*;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.syt.common.utils.PageUtils;
import com.syt.common.utils.Query;

import com.syt.mall.ware.dao.WareSkuDao;
import com.syt.mall.ware.entity.WareSkuEntity;
import com.syt.mall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import javax.swing.text.html.parser.Entity;

@Slf4j
@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService orderTaskService;

    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;

    @Value("${myRabbitmq.MQConfig.eventExchange}")
    private String eventExchange;

    @Value("${myRabbitmq.MQConfig.routingKey}")
    private String routingKey;

    /**
     * 自动解锁
     * -> 下单成功,库存锁定成功,接下来的业务调用失败,导致订单回滚.之前锁定的库存就要自动解锁
     * 订单失败
     * 锁库存失败
     *
     * 只要解锁库存的消息失败,一定要告诉服务解锁失败
     */


    private void unLockStock(Long skuId,Long wareId, Integer num, Long taskDeailId){
        // 更新库存
        wareSkuDao.unlockStock(skuId, wareId, num);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
        detailEntity.setId(taskDeailId);
        detailEntity.setLockStatus(2);
        orderTaskDetailService.updateById(detailEntity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");

                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }


            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前SKU的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

    }

    /**
     * 为每个订单锁定库存
     *(rollbackFor = NotStockException.class)
     * 默认只要是运行时异常都会回滚
     * @param vo
     *
     * 库存解锁的场景
     * 1.下单成功,订单过期没有支付系统自动取消,被用户手动取消,都要解锁库存
     * 2.下订单成功,库存锁定成功,接下来的业务调用共失败,导致订单回滚,之前锁定的库存就要自动解锁
     *
     * @return
     */
    @Transactional(rollbackFor = NotStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情,追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1.按照下单的收货地址,找打一个就近仓库,锁定库存

        //1.找到每个商品再哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品再哪里又库存
            List<Long> wareIds = wareSkuDao.ListWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());


        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStock = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个库存
                throw new NotStockException(skuId.toString());
            }
            //1.如果每一件商品都锁定成功,将当前商品锁定了几件的工作单记录发送给MQ
            //2.锁定失败.前面保存的工作单就回滚了,发送出去的消息,即使要解锁记录,由于去数据库查不到id,所以就不用解锁
            for (Long wareId : wareIds) {
                //成功就返回1 失败返回0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count==1){
                    skuStock = true;
                    // TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum() ,taskEntity.getId(),wareId,1);
                    orderTaskDetailService.save(detailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity,stockDetailTo);
                    //只发id不行,防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    //rabbitTemplate
                    rabbitTemplate.convertAndSend(eventExchange,routingKey,lockedTo);
                    break;
                }else {
                    //当前仓库锁失败,重试下一个
                }
            }
            if (skuStock == false){
                //当前商品所有仓库都没有锁住
                throw new NotStockException(skuId.toString());
            }
        }

        //3.肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unLockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        //解锁
        //1.查询数据库关于这个订单的锁库存消息
        // 有: 证明库存锁定成功了
        //      解锁:订单情况
        //          1.没有这个订单,必须解锁
        //          2.有这个订单,不是解锁库存
        //              订单状态:已取消,解锁库存
        //                  没取消:不能解锁库存
        // 没有:库存锁定失败,库存回滚了.这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId!=null){
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); //根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode()==0) {
                //订单数据返回成功
                OrderVo orderVo = r.getData(new TypeReference<OrderVo>() {});
                // 订单不存在
                if(orderVo == null || orderVo.getStatus() == OrderStatusEnum.CANCLED.getCode()){
                    // 订单已取消 状态1 已锁定  这样才可以解锁
                    if(byId.getLockStatus() == 1){
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            }else {
                //消息拒绝以后重新放入队列里面,让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        }else {
            //无需解锁
        }
    }

    //防止订单卡顿服务,导致订单状态消息一直改不了,库存消息优先到期,查订单状态新建状态,什么都不错就走了
    //导致卡顿的订单永远无法解锁库存
    @Transactional
    @Override
    public void unLockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存解锁状态,防止重复解锁库存
        WareOrderTaskEntity task  = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有, 没有解锁的库存,进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}